Extracts from the publication follow. This represents a small part of the 201 page publication. Dedicated chapters describe the background, history, mechanical workings, scientific principles, construction, assembly and operation of this beautiful and fascinating timepiece. Over 151 photographs, schematic drawings, design layouts and detailed drawings complement the comprehensive text. Considerable detailed dimensioning is incorporated, assisting in the construction of a working near replica suitable for any environment, including domestic settings.

*Please note that this website precludes an exact replication of the layout, font and indent styles used in the publication. The layout of the TABLE OF CONTENTS is, most especially, not represented.

This publication arose from a persistent fascination for the amazing work and achievements of a truly remarkable man - John “Longitude” Harrison. To those with an interest in pioneering science and engineering, Harrison’s astonishing technical work in the field of precision timekeeping is an alluring, rich, and absorbing subject. When combined with an inspiring story of human fortitude, self-belief, tragic failures and wonderful triumphs it becomes truly irresistible.

Sadly, for reasons beyond my understanding, much of Harrison’s work has been appallingly neglected and I felt a need to contribute something, however small, towards a correction of that situation. To that end, I’ve done my best to create a publication accessible to all, whatever their technical background. That hasn’t been easy and only the reader can decide whether it has been successful.

What is certain is that I’ve thoroughly enjoyed every single minute of it and, above all else, it is my sincere hope that you do, too.

David Heskin
Lancashire, England, 2007

(The following five chapter titles then follow, but the contents are not reproduced here)

ACKNOWLEDGMENTS

INTRODUCTION

BEGINNINGS

LONGITUDE

OBLIVION

PREVIEW OF TECHNICAL CHAPTERS

Whilst nothing within the following technical chapters could be described as difficult, there is undoubtedly a considerable amount of information and detail, much of which, although presented in disassembled form, is quite often interrelated. The layout of this publication has therefore been designed to lead the reader progressively and logically through the intricate mechanical workings and science of the Final Regulator. Relatively straightforward descriptions and explanations constitute the early technical chapters, whilst interconnected and occasionally convoluted (though, I repeat, not difficult) subjects are delayed until later. For that reason, amongst others, I would strongly recommend a first, careful reading of the text in precisely the order presented.

In support of the textual content, I've included two comprehensive pictorial chapters produced from my own version of a working “visual near replica”. A precise interpretation of the term “replica” will be defined in the MECHANICS chapter, together with an explanation of that interpretation. That ‘a picture speaks a thousand words’ was never more certain than in this application - the replica and the photographs derived from it are the indispensable backbone of my description and explanation. Information relating specifically to the replica is necessarily included throughout the text, but great effort has been expended in an attempt to make honest distinctions between original features and those peculiar to the replica. Not least, although best appreciated in the flesh, Harrison’s Final Regulator is an object of considerable beauty in its own right, and I trust that the photographs, albeit of the replica, convey this as no other written method could.

The separation, layout and content of the technical chapters have been designed with two readers in mind. The first reader would be interested in understanding some or all aspects of the history, design, mechanics and science of the Final Regulator, but would have absolutely no intention of attempting construction. It may be that this reader will elect to abbreviate one or two chapters and appropriate guidance will be given as those chapters arise. The second reader would be keen to construct his or her own regulator replica. For this reader, it is recommended that the text should still be first read in the order presented, but thereafter, by design, used as an “easy reference”, consulting the appropriate self-contained chapter(s) according to the phase of construction, assembly, operation or research.

In order to cater for all readers, whatever their technical background, I have, wherever possible, dispensed with, or simplified, strictly correct (but often obscure) horological, scientific and engineering terminology and substituted phraseology that should convey clearer meaning to all. In addition, a dedicated chapter (discussed shortly) lists and explains many of those words and phrases, in order to assist when they are used. I trust that the purists and experts will understand and accept this approach.

I am well aware that the chosen layout and objectives have led to occasional repetition. It was my belief that clarity and ease of reference demanded a higher priority than the economical or elegant use of words.

SUMMARY OF CHAPTERS

We should first discuss, in retrospect, the TABLE OF CONTENTS. The content of this publication is composed of chapters, made up of numerous “sections” (with the exception of the pictorial chapters). Each section deals with a single aspect of the applicable subject, and a title, describing that single aspect, has been ascribed to every section, for inclusion in the TABLE OF CONTENTS. The result is a long and detailed table of contents, which should assist in the speedy and accurate location of a chosen topic.

The GENERAL PICTORIAL chapter shows overall views of the replica regulator and the movement in various stages of disassembly, revealing the general layout of the mechanism within.

The next chapter, entitled MECHANICS, is devoted to descriptions of the assemblies, sub-assemblies, components and mechanical devices contained within the regulator. This serves as an introduction to Harrison's fascinating devices and lays the foundations upon which a more detailed understanding will be built in later chapters.

The DETAILED PICTORIAL chapter displays detailed views of assemblies, sub assemblies, individual components and mechanical devices within the “replica” regulator. Considerable dimensional information is included, in order to assist those who wish to construct their own “replica”.

PRINCIPLES OF PRECISION presents my interpretation, derived from Harrison’s original manuscripts, of the ingenious methods by which he combined his many mechanical devices. This is, arguably, the most important chapter of all, certainly in terms of my own objectives. Herein are the fascinating “secrets” responsible for the technical success of Harrison’s regulator system, invisible to all but the enlightened. Sadly and tragically, this also represents that part of Harrison’s work in greatest danger of becoming extinct.

Two chapters, CONSTRUCTION and ASSEMBLY, not only relate specifically to the production of the replica, but also provide a unique appreciation of the complexity of the mechanism and an insight into the challenges met by Harrison during its design and construction. In the process, these chapters add more depth to an understanding of the “replica” movement.

The OPERATION chapter has been designed for study after all previous chapters have been understood. It provides additional essential information, insight, fine detail and cohesion to the earlier chapters and is, therefore, absolutely vital to a complete understanding of the regulator. Quite obviously, this chapter also serves as a self-contained guide to the initial set up and everyday operation of the “replica”.

Two complementary chapters, ABBREVIATIONS and DIMENSIONING, are reference chapters, relating, in the main, to the DETAILED PICTORIAL chapter. The conventions explained herein were specifically devised to convey information economically and in a manner suited to the photographic method of presentation. A willing and open mind will readily adapt to the dimensioning system.

The TERMINOLOGY chapter is a vital reference for those who are unfamiliar with the wonderful names and phrases peculiar to horology. Although usage of many of the more obscure terms has been kept to a minimum, there will still be many occasions when those new to the subject may derive some benefit from this chapter.

In addition to its traditional function, the INDEX has been designed to guide the reader to their chosen topic sections. It is anticipated that this arrangement will be of particular assistance to those wishing to study every aspect of a particular device or method, by consulting those sections listed against the appropriate entry.

TABLE OF CONTENTS (formatting not as per the publication - see * above)